Across
- 3. a collection
- 5. year the distance that light Chan travel in 1 year(9.43 trillion kilometers)
- 7. the idea that the earth is the center of the heliocentric the idea that the sun is in the middle of the solar system
- 8. a large object that orbits a star
- 9. a small object that travels through space
Down
- 1. a collection of stars dust and gas’s that is held together by gravity
- 2. the idea that the universe began with a huge explosion
- 4. the study of the universe
- 6. all the matter in space